Lawrence crawford



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L. CRAWFORD.

RIVET FORGE.

APPLICATION FlLED IUNE 29,

Patented Oct. 14, 1919.

LAWRENCE ciiwFoRD, or YORK, N. Y.A

River-repen.

Application filed J un,e 12118, Serial No. 242,634..

To all whom t may concern:

Be it known that I, LAWRENCE CRAWFORD, a citizen of the United States, residing in New York, in the county of New York and State of New York, have invented certain new and useful Improvements in- Rivet- Forges, whereof the following is a specification, reference being had to the accom` panying drawings.

The invention relates to rivet forges and is more especially directed to means for automatically supplying fuel to such forges in proportion to the rate of combustion.

Accordingly my invention consists essentially of a fuel magazine, supported above the fire pan of a rivet forge in such a manner as to permit the automatic maintenance of a conical mound of the fuel in the fire pan, with resultant exposure of an annular band or ring of fire about the magazine for the purpose of heating the rivets.

rlhe invention is further directed to means for supporting the magazine so as to afford free access to the annular band or ring of fire above referred to.

In the drawings, Figure I, is a plan view of a rivet forge conveniently illustrating my invention, and

Fig. II, is a vertical longitudinal sectional view through the same.

The supporting legs and other adjunctive elements not essential to the present invention have been omitted for the sake of simplifying the illustrations.

The device consists of an open sheet metal fire pan 1, having the usual refractory lining indicated at 2. The fire pan l, is surmounted by a fuel magazine 3, which is preferably of sheet metal and cylindrical in form, and in any case smaller at its lower end than the top of the fire-pfan. A considerable interspace is allowed between the lower edge of the magazine and the top of the fire pan, in consequence of which the fuel from the magazine (indicated at F assumes the form of a conical mound as it is automatically fed by gravity during the process of consumption. The magazine is supported by a plurality of straps or struts 5, preferably three in number. By this con- Istruction, a substantially unbroken ring or band of re is at all times exposed for rivet heatmg. This is readily accessible from Specification of Patent.

Patented Oct. 14, 1919.

any angle, as clearly shown in Fig. I, and the rivets may be placed along radial lines as indicated at R in Fig. II, as a result of which, economy of space is effected and the efficiency of the device proportionately increased. By attaching the struts 5, which support the magazine 3, from the fire pan l, at points on the magazine a substantial distance above its lower end, the freest access is allowed to the frusto-conical band of fire exposed above the top of the fire-pan.

To enable combustion of the fuel to be forced, the fire-pan 1, is provided with some means for blowing air upward therethrough. For this purpose, I prefer to employ compressed air, which may be supplied from any convenient source by a pipe 6. Said pipe terminates in a diffusing nozzle 7, such as illustrated and described in U. S. Patent No. 1,248,816, granted me under date of December 4, 1917. This nozzle is located in a conduit 8, which leads to a throat or passage 9, communicating centrally with the fire pan 1, through the usual perforated twyer iron 10. In the present embodiment, the twyer iron is of comparatively large dimensions in order to effect a general even distribution of the air to the annular fire band above referred to. The outer end of the conduit 8, is closed by a threaded cap piece, which may beV readily removed to afford access to the interior. Said conduit is also pierced by a series of apertures 12, to permit the influx of a certain amount of atmospheric air. The removal from time to time of the accumulation of ash dust from the throat or passage 9, is facilitated through a removable cap piece 15, in its bottom.

It is to be understood that I do not wish to be confined to the precise details of construction and arrangement herein set forth, since various modifications may be made therein without departing from the spirit of my invention. Y

Having thus described my invention, I claim:

1. A rivet forge comprising an open firepan with means for blowing air upward therethrough, and a fuel magazine open at its lower end mounted above said fire-pan, the lower end of said magazine being substantially smaller than the top of the frepa'n and spaced a substantial distance therestantial distance above its lower end, so as 10 above, so that the fuel from the magazine to allow freest access to the fire. shall viform a rusto-conical band of re In testimony whereof, I have hereunto freely exposed and readily accessible above signed my name at Bristol Bucks county the top of said fire-pan. Pa. this 26th day of June 1918.

2. A rivet forge inI accordance with claim- LAWRENCE CRAWFORD. 1, wherein the magazine is supported from Witnesses: the re-pan by struts extending from the FRED SWANBERG, lire-pan to points on the magazine, a sub- ANDREW JoBsoN.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

' Washington, D. C. 

